Generalized vibration model and vibration transmission loss calculation method for vibration characteristic analysis of non-continuous core sandwich beam

By constructing a generalized vibration model and a method for calculating vibration transmission loss, the problem of analyzing the vibration characteristics of discontinuous core sandwich beams was solved, enabling accurate description of bending wave propagation characteristics and structural optimization, and providing an effective theoretical tool.

CN120296847BActive Publication Date: 2026-07-14NANJING FORESTRY UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING FORESTRY UNIV
Filing Date
2025-04-09
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing technologies cannot effectively analyze the vibration characteristics of discontinuous core sandwich beams, leading to difficulties in structural vibration control, inability to accurately describe the propagation relationship of bending waves and the contribution of each component, and affecting structural design and optimization.

Method used

A generalized vibration model is established. By constructing the reflection and transmission matrices of the discontinuous core sandwich beam and combining the dynamic models of the coupled and uncoupled sections, the propagation characteristics of bending waves are analyzed, and the method for calculating vibration transmission loss is derived.

Benefits of technology

It enables precise analysis of the vibration characteristics of discontinuous core sandwich beams, provides theoretical tools for structural design optimization and bending wave control, and has universality and scalability, and can analyze the energy reflection and transmission relationship of bending waves.

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Abstract

The application provides a generalized vibration model and a vibration transmission loss calculation method for vibration characteristic analysis of a non-continuous core sandwich beam, which has universality and scalability. The generalized vibration model, the sandwich beam is composed of an upper beam, a lower beam and discrete cores, and the sandwich beam includes a coupling section containing cores and a non-coupling section not containing cores; when the non-continuous core sandwich beam contains N cores, N is greater than or equal to 2, the left and right ends of the first core from left to right and the intersection points A, B, C and D of the upper and lower beams are non-continuous characteristic points, the A and C ends are the incident ends of the bending wave, the reflection matrix of the bending wave at the incident end and the transmission matrix of the bending wave from the left end to the right end are respectively the reflection matrix of the bending wave at the incident end and the transmission matrix of the bending wave from the left end to the right end when the non-continuous core sandwich beam contains N-1 cores.
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